refactor(measured boot): rename a macro INVALID_ID to EVLOG_INVALID_ID

Renamed a macro 'INVALID_ID' to 'EVLOG_INVALID_ID' to avoid its clash
with other macro names and to show it is explicitly used for Event
Log driver.

Change-Id: Ie4c92b3cd1366d9a59cd6f43221e24734865f427
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
4 files changed